访问控制器中的参数列表 [英] Accessing a list of params in controller

问题描述

我非常新的grails（1.3.7）所以请耐心等待： - ）

Im very new to grails (1.3.7) so please be patient :-)

我有一个gsp我有各种复选框。用户可以点击它们，然后将他的答案发送给控制器。

I have a gsp where I have various checkboxes. A user can click on them and then send his answer to a controller. The controller is receiving this request correctly.

我的问题是，为了处理用户选择的内容，我必须检查每个参数 - 看看这个复选框是否真的检查。这真的很繁琐，并且不工作很好，因为显示复选框的页面是动态的 - 所以可以点击的复选框是动态的。在我的控制器中，我不知道我必须检查哪些参数。

My problem is, that, for working with what the user chose, I have to check every parameter - to see if this checkbox was really checked. Thats really cumbersome and doesnt work very well, because the page displaying the checkboxes is dynamic - so the checkboxes which can be clicked are dynamic too. In my controller I dont know for which params I have to check then.

有可能接收所有复选框的列表（或更好：所有复选框）我的控制器？我研究了，但没有找到答案！

Is there any possibility to receive a list of all checkboxes (or better: all checked checkboxes) in my controller? I researched but didnt find an answer!

感谢回答！ :-)

谢谢你，

params.name.each{i->
            System.out.println(i);
}

是非常简单和工作:-)它只是回馈检查的

is very simple and works :-) It just gives back the checked ones

推荐答案

它必须作为一个额外的请求参数传递（这是http的限制）。您可以在表单中添加以下字段，例如：

It must be passed as an extra request parameter (it's a limitation of http). You can add following field into your form, for example:

<input type="hidden" name="checkboxes" value="${myCheckboxesNames.join(',')}"/>

或使用JavaScript制作，因为它的名称在客户端是动态的。

or making same using JavaScript, as it names are dynamic on client side.

BTW，您还可以通过

BTW, you can also check all request parameters, by

params.each { name, value ->
// so something
}

所以如果你使用一些特殊的前缀/ suffix为这个复选框的名称，它将是：

so if you are using some special prefix/suffix for this checkbox names, it would be:

params.entrySet().findAll {
   it.key.startsWith(prefix)
}.each {
   println "Checkbox $it.key = $it.value"
}

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